In 1998, the California Regional Water Quality Control Board (RWQCB) scientists were trained to use the Geospatial Waterbody System (GeoWBS), developed by the Information Center for the Environment (ICE). The Regional Board scientists are currently using the system to report waterbody assessments to the EPA, as mandated by the Clean Water Act. As part of ICE’s continuing work with the GeoWBS database, ICE staff members visited each RWQCB in California to assist the scientists with geographic delineation of waterbodies that will be included in the 303(d) report.